Like a lot of people, we have multiple domains that we accept email on. We basically have two companies in the same building: @company1.com and @company2.com. Both use the same exchange server and it works just fine. I set the users for copmany1 to have a primary SMTP address as that domain and the users for company2 to have a primary for the other domain.... so in other words when company1 users email outbound their email address shows as email@example.com and when users from the second company email out their email shows as firstname.lastname@example.org.
My problem is reverse DNS. RDNS only allows one domain to be set per IP address. Can Exchange send outgoing email over one IP address for one domain and another IP for the other? I have 5 IP's from my ISP and I know how to translate outgoing mail to a specific IP, but I need to have a unique identifier from the inside traffic because currently I'm translating all traffic from my mail server's IP over port 25.......however that includes outgoing email from both domains. Does that make sense? Thanks so much!